Super-sitting experience, but possibly prone to leak

The material is very pleasant: cloth-like, dull, but soft and pliable. The sitting experience is dynamic but stable. The hips can be moved in all 3 spatial dimensions, without the cushion inhibits the freedom of movement. (Provided, of course, that there is enough air in the cushion is to avoid "ground contact".)
I find the grooves in the middle very important: they reduce the pressure on the pelvic floor considerably.

The pump is quite valuable and works very well.
The valve in the pillow but you can quite easily pull from its socket when you pull the Aufpumpnadel. To prevent this, you have to hold back with your fingers while pulling out as the needle.

The first cushion was flat (ie leaking). It was leaking at one of the small bridges that connect the sides.
The second pillow was tight, but shows a similar infirmity (cracking) at the outer edges of the two webs.
It would not surprise me if it is leaking in a few years.
But TOGU is indeed 30 years warranty. Since I'm off the hook.